了解一下你的神经反应的速度

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And that means it's very slow. Linden says getting a simple message from our feet to our brain can take a remarkably long time. To get a sense of just how long, he says, imagine a giant with her head in Baltimore and her toe off the coast of South Africa. If a shark bit that toe on Monday, Linden says, "she wouldn't feel it until Wednesday, and she wouldn't jerk her toe until Saturday."